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NERVES OF THE THORAX
Terms in this set (47)
What are the phrenic nerve cord levels?
C3, 4, 5
The phrenic nerve enters the thorax after passing down what?
the anterior surface of the scalenus anterior muscle
It descends between the mediastinal pleura and fibrous pericardium and is accompanied throughout its length by what?
the pericardiacophrenic artery
Where does the phrenic nerve passes anterior at?
to the root of the lung
What are the functional components of the phrenic nerve?
What does the motor supply of the phrenic nerve supply?
What does the sensory supply of the phrenic nerve supply?
pain fibers from the diaphragm, pericardium, pleura, and peritoneum
What is the accessory phrenic nerve?
a variation which arises from C5 and which is a branch of the nerve to subclavius
When an accessory phrenic nerve is present, what happens to the sectioning of the phrenic nerve?
the phrenic nerve will not completely paralyze the corresponding half of the diaphragm
Where does the sympathetic trunk extends from?
the base of the skull to the coccyx on either side of the vertebral column
Where is the sympathetic trunk located?
anterior to the neck of the ribs
What connects to the thoracic spinal nerves to the sympathetic trunk?
by the gray and white rami communicantes
What does the gray rami communicantes contain?
postganglionic sympathetic fibers and are connected to every spinal nerve
Where are nerve cell bodies of the gray rami communicantes located?
in the sympathetic trunk
What does the white rami communicantes contain?
preganglionic sympathetic fibers and are limited to spinal cord segments T1 to L2
Where are nerve cell bodies of the white rami communicantes located?
in the lateral horn (intermediolateral cell column) of the spinal cord
Where does the sympathetic trunk passes from?
the thorax to the abdomen behind the medial arcuate ligament or through the crura of the diaphragm
What is the cervicothoracic (stellate) ganglion formed by?
the fusion of the inferior cervical with the first thoracic ganglion
Within the thorax, what does the sympathetic trunk gives off?
cardiac, pulmonary, mediastinal, and splanchnic branches
What are splanchnic nerves?
the major visceral branches of the sympathetic trunk which supply abdominal viscera
What are the major visceral branches of the splanchnic nerves?
1. greater splanchnic
2. lesser splanchnic nerve
3. least splanchnic nerves
What is the vertebral level of the greater splanchnic?
What is the vertebral levels of lesser splanchnic nerve?
T10 - T11
What is the vertebral levels of the least splanchnic nerve?
All three splanchnic nerves reach the abdomen by piercing the ____?
the crura of the diaphragm, and end in abdominal ganglia
Aside from its sympathetic fibers, the trunk also carries sensory (pain) fiber from where?
thoracic, abdominal, and pelvic viscera
Where does the right vagus nerve enter the thorax?
anterior to the right subclavian artery
Where does the left vagus enters the thorax between?
the left common carotid and left subclavian arteries
Within the thorax, the vagus nerve gives off the recurrent laryngeal nerves, and branches to ____?
the autonomic plexuses of the thorax
The right recurrent laryngeal nerve hooks around what?
the right subclavian artery
The right recurrent laryngeal nerve ascends into where?
into the neck between the trachea and esophagus
The left recurrent laryngeal nerves hooks around what?
the arch of the aorta posterior to the ligamentum arteriosum
Where does the left recurrent laryngeal nerve ascends into?
the neck between the trachea and esophagus
The vagus nerve passes posterior to what?
the root of the lung
What forms the esophageal plexus along the esophagus?
the vagus nerve
The esophageal plexus then come together to form the anterior and posterior vagal trunk near what structure?
What is the functional components of the vagus nerve?
What is the motor supply of the vagus nerve to?
muscles of the pharynx and larynx only- not to thorax
What is the sensory supply to the vagus nerve to?
thoracic and abdominal viscera
What is the parasympathetic to the vagus nerve to?
thoracic and abdominal viscera
What are the autonomic plexuses of the thorax?
1. cardiac plexus
2. pulmonary plexus
3. esophageal plexus
4. thoracic aortic plexus
Describe the cardiac plexus.
related to the arch of the aorta
What does the cardiac plexus control?
heart rate and is subdivided into superficial and deep parts
What is the pulmonary plexus related to?
the root of the lung
What is the esophageal plexus formed along?
What is the thoracic aortic plexus?
a delicate network of nerves along the thoracic aorta and its branches
Where does the different autonomic plexuses of the thorax receive sympathetic fibers from?
the sympathetic trunk and parasympathetic fibers from the vagus
THIS SET IS OFTEN IN FOLDERS WITH...
UNIT II- LARYNX AND THORAX
LYMPHATICS OF THE HEAD AND NECK - UNIT 2
BREAST - UNIT 2
THORACIC WALL - UNIT 2
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